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hi from uk most rear brake calipers have auto adjust mechanism and yours may be the same as on uk models whereas to compress the piston back into caliper to facilitate fitting new pads ? you have to both press and rotate piston and this sends piston back on the screw auto adjuster you will notice that piston has a couple of slots on its head ? this is there for enabling screw back having said this there is a rear caliper piston compress tool that does this job and the cheapest tool and good quality is made by draper tools and costs approx £10 in uk but can be obtained at any good auto stores and has instructions on use well worth the investment ? just one tip pistons normally screw back clockwise however! on fiats? the nearside screws anticlockwise so just observe that piston is going back when rotating c/wise if not you can fit a 3/8" drive extension and t bar to the rotator boss and using pressure ?turn piston a/clockwise hope this helps one word of advice !make sure you bleed brakes afterwards to clear out dirty fluid untill clean fluid shows this will improve brake pedal best wishes from uk

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Hi, if you are replacing the rear pads, you will need a special caliper tool(can be purchased or rented from Autozone or Discount Auto Parts) to reseat the piston as it has to be turned or rotated inward to reseat..

To move the piston back into the caliper, the LH piston is turned clockwise and the RH piston is turned counterclockwise. NOTE: A moderate to heavy force toward the caliper piston must be applied. If sufficient force is not applied, the internal park brake mechanism clutch cone will not engage and the piston will not compress. Using the special tool (or equivalent such as OTC tool 7317A), compress the brake caliper piston into its cylinder.

In an emergency, you can use needle nose pliers, but be careful not to pinch the rubber boot or seal as this will create a leak of brake fluid....

You need to compress the caliper piston back into the caliper assembly to allow the new pads to fit over the rotor. A C clamp can be used to compress the caliper piston. Be sure to remove the brake reservoir cap before compressing the piston and remove excess fluid from the reservoir to prevent over filling.

A special tool is required to compress the caliper piston on the rear brakes-don't use a C-clamp on the piston.Raise the vehicle and remove the tire. The rear calipers have only one guide pin. Remove this pin and raise the caliper. Remove the old brake pads. Using the special tool compress the caliper piston-the piston will have one or two slots on it. These slots must in the correct position to remount the caliper. Install the new brake pads and slide the caliper back over the rotor and replace the guide pin. If the caliper doesn't slide over the rotor you'll need to reset the slots on the piston. Replace the tires and you're ready to go.

There's a special tool required to compress the rear caliper pistons. You may want to rent the tool. If you look at the piston you'll see one or two notches. The special tool has nipples to fit these notches. The caliper piston will have to be compressed with the tool and the notches will have to be placed in the o'clock and 6 o'clock for the brake pads to slide over the rotor. If you rent the special tool have the renter show you how to use it.

hi from uk most rear brake calipers have auto adjust mechanism and yours may be the same as on uk models whereas to compress the piston back into caliper to facilitate fitting new pads ? you have to both press and rotate piston and this sends piston back on the screw auto adjuster you will notice that piston has a couple of slots on its head ? this is there for enabling screw back having said this there is a rear caliper piston compress tool that does this job and the cheapest tool and good quality is made by draper tools and costs approx £10 in uk but can be obtained at any good auto stores and has instructions on use well worth the investment ? just one tip pistons normally screw back clockwise however! on fiats? the nearside screws anticlockwise so just observe that piston is going back when rotating c/wise if not you can fit a 3/8" drive extension and t bar to the rotator boss and using pressure ?turn piston a/clockwise hope this helps one word of advice !make sure you bleed brakes afterwards to clear out dirty fluid untill clean fluid shows this will improve brake pedal best wishes from uk

The rear calipers on these models require a special tool that compresses and turns the piston in at the same time -- most parts stores carry this tool.It is called a caliper piston press -- and it installs where the pads would go and acts like a c-clamp,when turning handle it will turn the caliper piston backinto the caliper as it compresses it. Anytime the brake rotor or brake pads are being replaced, the rear caliper piston must be seated (bottomed) to compensate for the new brake rotor or lining. Because the Parking Brake self-adjuster mechanism is attached to the piston, a special seating method is required. The only acceptable method is by rotating the piston back into the bore using Retractor,MILLER Special Tool 8807, . Any other seating method will damage the self-adjuster mechanism.Good luck and hope this helps.

The pistons on the rear brake calipers SCREW in to the caliper. There
are notches on the inner edge of the piston face. engage the notches
with a large needle nose plier or a large flat washer and turn
clockwise (as you face the piston) to turn the piston in.
There is a special tool that is available at your local
autoparts store that is absolutely necessary and will save you a ton of
time and aggravation. Using a needle nose plier or washer does not
allow you to apply enough pressure unless your are the incredible hulk.